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Sling Style
Individualized Serial Number
Chain Size & Grade
Exact Length of the Sling
Working Load Limit
Grade 80 DOF Chain Sling is a double-leg lifting assembly manufactured from quenched and tempered Grade 80 alloy steel chain and components. The sling is fitted with a Grade 80 oblong master link on the top and two Grade 80 foundry hooks on the bottom, providing a large hook opening for secure two-point lifting. The double-leg design offers improved load stability and balanced force distribution, making it suitable for heavy castings, steel fabrications, machinery handling, and industrial lifting. Each sling is permanently identified with a serial number, chain size, grade, exact sling length, and Working Load Limit to ensure complete product traceability.
Grade 80 DOF Chain Sling is a double-leg lifting assembly manufactured from quenched and tempered Grade 80 alloy steel chain and components. The sling is equipped with a Grade 80 oblong master link on the top and two Grade 80 foundry hooks on the bottom, making it suitable for heavy-duty lifting applications requiring large hook openings and balanced two-point load distribution.
The foundry hooks feature an extra-wide throat opening for connecting to large lifting lugs, castings, steel fabrications, and oversized components that cannot be accommodated by standard sling hooks. The double-leg configuration distributes lifting forces evenly between two attachment points, improving load stability and handling efficiency while maintaining a 4:1 design factor.
D = Double Leg
O = Oblong Master Link
F = Foundry Hook
DOF therefore refers to a Double Leg Chain Sling fitted with an Oblong Master Link on the top and Two Foundry Hooks on the bottom.
Each sling is permanently identified with:
Individual Serial Number
Chain Size
Chain Grade
Exact Sling Length
Working Load Limit (WLL)
The serial number on the identification tag corresponds with the written certification and sales order record, ensuring complete product traceability throughout its service life.
| Design Factor | 1-Leg Sling | 2-Leg Sling | 3-Leg & 4-Leg Slings | ||||
| 4:1 |  |  |  | ||||
| Chain Diameter | 90 Degrees | 60 Degrees | 45 Degrees | 30 Degrees | 60 Degrees | 45 Degrees | 30 Degrees |
| Load Factor: 1 | Load Factor: 1.7 | Load Factor: 1.4 | Load Factor: 1 | Load Factor: 2.6 | Load Factor: 2.1 | Load Factor: 1.45 | |
| 7/32″ | 2,100 | 3,600 | 3,000 | 2,100 | 5,500 | 4,400 | 3,200 |
| 9/32″ | 3,500 | 6,100 | 4,900 | 3,500 | 9,100 | 7,400 | 5,200 |
| 5/16″ | 4,500 | 7,800 | 6,400 | 4,500 | 11,700 | 9,500 | 6,800 |
| 3/8″ | 7,100 | 12,300 | 10,000 | 7,100 | 18,400 | 15,100 | 10,600 |
| 1/2″ | 12,000 | 20,800 | 17,000 | 12,000 | 31,200 | 25,500 | 18,000 |
| 5/8″ | 18,100 | 31,300 | 25,600 | 18,100 | 47,000 | 38,400 | 27,100 |
| 3/4″ | 28,300 | 49,000 | 40,000 | 28,300 | 73,500 | 60,000 | 42,400 |
| 7/8″ | 34,200 | 59,200 | 48,400 | 34,200 | 88,900 | 72,500 | 51,300 |
| 1″ | 47,700 | 82,600 | 67,400 | 47,700 | 123,900 | 101,200 | 71,500 |
| 1-1/4″ | 72,300 | 125,200 | 102,200 | 72,300 | 187,800 | 153,400 | 108,500 |
Name: Grade 80 DOF Chain Sling – Double Leg w/ Oblong Master Link on Top and Foundry Hooks on Bottom
MOQ: 100 Sets
Package: Carton + Steel Pallet
Manufacturing Standards: Manufactured from quenched and tempered Grade 80 alloy steel chain and components in accordance with EN 818-2, EN 1677-1, EN 1677-2, EN 1677-4, ASME B30.9, OSHA 1910.184, AS 2321, and ISO 3077 requirements for Grade 80 lifting chain sling assemblies.
Testing Standards: Manufactured with a minimum design factor of 4:1. Each sling is proof tested, visually inspected, dimensionally verified, and checked for component compatibility before shipment. The chain complies with EN 818 fatigue requirements and successfully withstands 20,000 load cycles at 1.5 times the Working Load Limit (WLL). Every sling is supplied with an individual serial number, identification tag, written certification, and complete traceability records.
Application Standards: Suitable for overhead lifting, two-point lifting, heavy castings, structural steel, machinery installation, foundry operations, mining maintenance, equipment manufacturing, and industrial material handling.
Maintenance Standards: Inspect before each use for chain elongation, excessive wear, cracks, corrosion, deformation of foundry hooks, damaged master links, connecting links, and missing identification tags. Remove the sling from service immediately if defects exceed the applicable inspection criteria.
